Machine for making sheet-metal screw-caps.



H. GRAF.

MACHINE FOR MAKING SHEET METAL SCREW CAPS.

APPLICATION FILED APRZI, 101].

mante@ Aug. i@ 1913.

4 SHBETSnSHEET L NRW H. GRAF. MACHINE FOR MAKING SHEET METAL' SCREW CAPs.

APPLICATION FILED APR. 21., 1911.

Patented Aug. 19, 1913.

4 SHEETS-SHEET Z.

www5@ /wf W1 a A H. GRAF.

MACHINE POR MAKING SHEET METAL SCREW CAPS.

APPLICATION FILED 111111.21, 1911.

1,670,682, Patented. Aug. 19, 1913,

4 SHEETS-SHEET 3.

H. GRAF.

MACHINE POR MAKING SHEET METAL SCREW CAPS,

APPLICATION FILED APR.21, 1911 L?,682 Patented Aug'. 19, 1913.

.4 SHEETS-SHEET 4,

UNITED STATES .PAENT FFlCE.

HENRY GRAF, F TOLEDO, OHIOy SSIGNOR TO MERICAN CAN COMPANY, OF YORK, N. Y.. A CORPRATION 0F NE'W JERSEY.

MACHINE FOB MAKING SHEET-METAL SCREW-CAPS.

Specication of Letters Patent.

Application led April 2l., 1811.

Patented Aug". t9, i913.

serial n. 622,499.

l zen of the United States, residing in Toledo,

inthe county of Lucas and'ltate of Ohio,

vhave invented a new and useful Improvement in Machines for Making Sheet-lletal Screw-Caps, of which the following is a specification.

My invention relates to improvements in machines for making sheet metal screw caps, such as 'are used for closing fruit jars and other vessels.

The object of my invention is to provide` an improved construction of screw cap machine by means of which the sheet metal caps may be rapidly and conveniently fed to the screw threading devices and screw threaded and discharged from the-machine.

My invention consists in the novel construction of parts and devices and inI the novel combinations of arts and devices herein shown and descri ed by which this object or result is practically accomplished, the same 4being more particularly specified in the claims.

In the accompanying drawing forming a part of this specification, Figure 1 is a side elevation of a screw cap machine embodyingmy invention. F ig. 2 is a plan view.

Fig. 3 is an end elevation. Fig. i is a detail, vertical, cross section on line 4 4 of Fig. 2. Fig, 5 is a detail section on line 5 5 of Fig. 2 and Fig. 6 is a detail view, partly in section, illustrating the operation of theO mandrel and threading tool.

ln the drawing, 1 represents the frame of l the machine. 2 a rotary cap holding mandrel .having screw threads 3 at its end portion conforming to those desired to be formed upon the cylindrical or peripheral wall 4 of the sheet metal cap 5.

iIhe caps 5 to be screw threaded feed.

down by gravity through a -cap chute 6, which is normally in registry at its `'closed lower end 7 with the front end of the cap holding mandrel 2, but which is adapted to be retracted or Withdrawnv out of the way to permitthe discharge of the finished or screw threaded cap from the mandrel. The feed chute 6 is arranged suicientlyupright to permit the caps to feed down by gravity and is provided on the side or face thereof adjacent to the cap holdingmandrel 2 with an opening 8 to permit the lowerrnost cap to be withdrawn from the chute onto the manh drei by operation of the suction feed and compressed air discharging pipe 9 which is inside and is adapted to be reciprocated in, 'the cap holding mandrel 2.

The cylindrlcal or peripheral wall tof` the cap 5 is'screwv threaded by a rotary threading tool or roller 10, the shaft or spindle ll of which is journaled on a movable, preferably a swinging, support or arm 12 which is pivoted to the frame at 13 and moved back and forth as required to bring the threading tool or roller 10 into engagement with the cap holding mandrel at intervalsyas required.

The suction and compressed' air cap'feed- `'ing and discharging p1pe 9 is connected alternately with a vacuum or suction pipe 14 y and a vcompressedair pipe15 by means of a suction valve l@ and alcompressed air valve 17, both preferably' mounted'in a sinV le valve shell 18. f

o effect the feed or withdrawal of the lowermost cap 5 from the cap feed chute 6 and deliver it onto the cap holding mandrel 2, the suction and compressed air pipe 9 is rst movedforward into such lowermost' the cap holder mandrel 2. The threading' tooll or roller 10 is then moved up into engagement with the cap on the mandrel, and as the cap and mandrel continuously rotate, the cylindrical or peripheral Wall of the cap is formed with screw threads thereon. Simultaneously with this movement, the

feed 'chute is withdrawn out of the way to permit the discharge of the now screw threaded cap and the vacuum valve is closed.

Th threading tool or roller 10 ist-hen swung bac' into its original position and the compressed air valve is o ened, and the finished cap, which fits loose y on the cap holder mandrel, isy ejected or discharged by the compressed air admitted through the suc' tion and com ressed air pipe 9. After the discharge of t e finished cap, the feed chute is again advanced into position to bring its i lower 'end and the lowermostucap therein into registry with the cap holder mandrel and the compressed air valve is closed and iimiiov is 40s. zia will be inmiiiy E sfzfiug bom fm" iii :winni of tim fzmpres- 75 in vulve.

` daim .-M iii which 1. in n :sheen unitari chap 'ifiiifvudizig ilizwiiim, anni ,iii rihiii': ,i nzzion wifi: u cap holder liizmfiiei l: nii @ng-ige Hifi iiilci'ifi of Hiv Cap 3() tuoi. if u 'xp filed (finite lmw' imi m'uviiifwi f winning m Lire sidi m'eri mvli'riwni ui' bi1@ inw-mmm( up, :imi im :zii: @minimi pipe iiisdc ih@ mp imiilr mzing5 zlp'cd to mi; 'i invading im speci d.

@Mmmm Loroee `'and disohar ing the threaded caps from said mandre, enjair suction. valve and a compressed airvelve, substantially as specil fied.

,"l". The combination with a cap holder mandrel-and' a threading tool coperating therewith, the one'movable in respect to the other, of a movable cap holder chute and an air pipe to delivei` the caps one by one from the chute onto the mandrel and to discharge them from the. mandrel, said pipe being connected to means for exhausting air from the pip@ substantially as specified.

8. The "combination with a cap holder mandrel and a threading tool eoperating therewith7 the one movable in respect to the chute and a re-V other, of a movable cap holder chute and en' air pipe to deliver the caps one by one 'from the chute onto the mandrel and to ds charge them from the mandrel, an air suetion valve and a compressed air valve, sub stantally as s leeiied..

9. The oom ination with a cap helder mandrel and a threading tool coperatng therewith, the one movable in respect to the other, of a movable cap holder chute and an air pipe to deliver the caps vone by one from the chute onto the mandrel and to discharge them from the mandrel, and means lfor reciprocating said air pipe Within the man drel, substantially as specified.

HENRY GRAF.

Witnesses:

L. W BREEDE, JNO. BLANK. 

